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I am looking for method and implementation to replace background in video. My goal looks like Youtube video. The author said that he used threshold value to extract background and replace them. However, I don't believed that threshold can acheived very nice result. Could you suggest to me any method that available in opencv for real time replacing background in opencv. Thank you in advance

I am looking for method and implementation to replace background in video. My goal looks like Youtube video. The author said that he used threshold value to extract background and replace them. However, I don't believed that threshold can acheived very nice result. Could you suggest to me any method that available in opencv for real time replacing background in opencv. Thank you in advance